Rees: The Micro-Injection of Pararnaecium 



239 



Table IV. Of the nine sueeessfuly injected, one was dead in thirty 

 minutes, eight were normal at the end of one hour, and four at the 

 end of twelve hours. 



The injected fluid comes in contact not only with the endoplasm 

 but also with the ectoplasm. The dose was not constant but was equal 

 in volume to about one-fifth of the body of Paramaccium. The path 

 followed by this injected fluid was, therefore, in part different from 

 that taken by fluid entering the food vacuoles through the eyto- 

 pharynx. Unlike injected droplets of mercury which were soon cast 

 out of the body, the injected fluids were retained at least during the 

 five to fifteen minutes of careful observation immediately after the 

 injection. 



